This question is about addition polymerisation and polymer structures.
a.[2]
Phenylethene (C6H5CH=CH2\text{C}_6\text{H}_5\text{CH}=\text{CH}_2C6H5CH=CH2) undergoes addition polymerisation to yield poly(phenylethene), commonly known as polystyrene. The chemical equation representing this process is shown below:
Identify the chemical group represented by WWW and the symbol represented by ZZZ.
b.[2]
Poly(phenylethene) is classified as a thermosoftening polymer. Suggest why thermosoftening polymers are easier to recycle and reshape than thermosetting polymers.
c.[3]
Explain why high-density poly(ethene) (HDPE) has a higher density than low-density poly(ethene) (LDPE) by referring to the arrangement of their polymer chains.